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Hydrogeomorphic and Spatio-Temporal Analysis of Riverine Wetlands in the Interfluvial Zone of Ganga and Sai Rivers, Uttar Pradesh, India

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Abstract

An extensive riverine wetlands system, which includes two Ramsar sites, occurs in the interfluvial zone between the Ganga and Sai Rivers in the Gangetic plains. Channel avulsion has formed a system of sinuous channel wetlands and floodplain wetlands, such as oxbow lakes, meanders, complex scrolls, and the remnant of fluvial features that grew through erosional and depositional processes, resulting in riverine wetlands. These riverine wetlands are significant but endangered and threatened biodiversity hotspots. The study of spatial distribution and temporal change analysis of these riverine wetlands are very much necessary for assessment and management. Extraction, delineation and mapping of these riverine wetlands in the GIS environment using remote sensing data reveal that these riverine wetlands belong to an unstable fluvial system with low energy and high sediment yield. The spatio-temporal changes in the areal extent of these riverine wetlands have been assessed by an image-to-image change detection method based on spectral indices (NDVI and MNDWI) derived from satellite imagery from 2000 to 2019. The analysis showed that the floodplain wetlands are shrinking continuously, whereas the channel wetlands shrank up to 2014 and afterwards increased gradually due to rejuvenation activities; however, the overall trend is still decreasing with respect to the year 2000. Drought conditions prevail frequently, and extreme stress due to land use and land cover changes, along with the groundwater exploitation, will likely lead to continued declines in these unstable, low-energy riverine wetlands in the near future, which will ecologically and environmentally affect the interfluvial zone of the Ganga and Sai Rivers.

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Data Availability

All data produced from this study are provided in this manuscript. The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors are highly grateful to the Department of Civil Engineering, Indian Institute of Technology (BHU), for providing facilities for this study. The authors express thanks to the University Grants Commission (UGC), New Delhi, India, for financial assistance.

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All authors contributed to the study’s conception and design. Material preparation, data collection and analysis were performed by Sandeep Kumar Maddheshiya and Nikhilesh Singh. Prof. Sanjay Tignath, Dr Medha Jha and Sandeep Kumar Maddheshiya have made the data interpretation. The first draft of the manuscript was written by Sandeep Kumar Maddheshiya. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Medha Jha.

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Maddheshiya, S.K., Jha, M., Tignath, S. et al. Hydrogeomorphic and Spatio-Temporal Analysis of Riverine Wetlands in the Interfluvial Zone of Ganga and Sai Rivers, Uttar Pradesh, India. Wetlands 43, 9 (2023). https://doi.org/10.1007/s13157-022-01654-3

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